What do you give a pregnant Princess travelling on the tube? A Baby on Board badge, naturally!
The Duchess of Cambridge was given the badge during an official engagement at Baker Street station, which she attended alongside the Queen and Duke of Edinburgh.
The trio were visiting Baker Street station to mark London Underground's 150 year anniversary.
London Underground's chief operating officer Howard Collins presented Kate with the badge, and she promptly held it up to her designer coat, which our fash-wan spies tell us is Malene Birger.
Kate told Howard: "Oh yes I've seen this before. I used to use the Tube on a regular basis. I miss travelling on the Tube", before promising to wear it at home.